$seca\:csca\:-\:cos^2=sin^2a$
$4x^2+3+25$
$45+-1$
$\left(\frac{1}{2}x+\frac{1}{2}y\right)^2$
$\csc^2x+1=-\cot^2x$
$4x+130x+25$
$2sin^2x-5sinx=0$
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